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Area of Science:

  • Materials Science
  • Polymer Science
  • Rubber Technology

Background:

  • Ground tire rubber (GTR) is a recycled material with potential applications in polymer blends.
  • Thermoplastic modifiers can alter the properties and processability of rubber materials.

Purpose of the Study:

  • To investigate the microstructure and processing-performance property interrelationships of GTR/thermoplastic blends.
  • To evaluate the effect of different thermoplastic modifiers (TOR, EVA, EOC, LLDPE) on GTR blends.
  • To determine the influence of GTR/thermoplastic ratio on blend characteristics.

Main Methods:

  • Melt-compounding of GTR/thermoplastic blends (50/50 and 75/25 wt.%).
  • Characterization using AFM, SEM, RPA, Mooney viscometer, DSC, tensile tests, and swelling behavior.
  • Analysis of microstructure, processing behavior, and physico-mechanical properties.

Main Results:

  • Thermoplastic type significantly influenced processing behavior and microstructure in GTR-rich blends.
  • GTR/thermoplastic ratio affected elongation at break, hardness, and density, but not tensile strength.
  • DSC indicated thermoplastics act as binders, not plasticizers, with near-constant glass-transition temperatures.
  • RPA showed higher viscoelastic moduli (G*, η*) in GTR-rich blends.
  • SEM and AFM confirmed rubber-like interfacial breaks and contact between GTR and thermoplastics.

Conclusions:

  • Thermoplastic modifiers play a crucial role in tailoring the properties of GTR blends.
  • The investigated thermoplastics function as binders, enhancing the structural integrity of GTR composites.
  • Understanding these interrelationships is key for developing advanced GTR-based materials.